#ifndef STAN_MATH_PRIM_SCAL_PROB_NEG_BINOMIAL_2_CCDF_LOG_HPP
#define STAN_MATH_PRIM_SCAL_PROB_NEG_BINOMIAL_2_CCDF_LOG_HPP

#include <stan/math/prim/scal/err/check_consistent_sizes.hpp>
#include <stan/math/prim/scal/err/check_not_nan.hpp>
#include <stan/math/prim/scal/err/check_positive_finite.hpp>
#include <stan/math/prim/scal/fun/grad_reg_inc_beta.hpp>
#include <stan/math/prim/scal/meta/length.hpp>
#include <stan/math/prim/scal/prob/neg_binomial_ccdf_log.hpp>

namespace stan {
  namespace math {

    // Temporary neg_binomial_2_ccdf implementation that
    // transforms the input parameters and calls neg_binomial_ccdf
    template <typename T_n, typename T_location, typename T_precision>
    typename return_type<T_location, T_precision>::type
    neg_binomial_2_ccdf_log(const T_n& n,
                            const T_location& mu,
                            const T_precision& phi) {
      if (!(stan::length(n)
            && stan::length(mu)
            && stan::length(phi)))
        return 0.0;

      static const char* function("neg_binomial_2_cdf");
      check_positive_finite(function, "Location parameter", mu);
      check_positive_finite(function, "Precision parameter", phi);
      check_not_nan(function, "Random variable", n);
      check_consistent_sizes(function,
                             "Random variable", n,
                             "Location parameter", mu,
                             "Precision Parameter", phi);

      VectorView<const T_location> mu_vec(mu);
      VectorView<const T_precision> phi_vec(phi);

      size_t size_beta = max_size(mu, phi);

      VectorBuilder<true, typename return_type<T_location, T_precision>::type,
                    T_location, T_precision> beta_vec(size_beta);
      for (size_t i = 0; i < size_beta; ++i)
        beta_vec[i] = phi_vec[i] / mu_vec[i];

      return neg_binomial_ccdf_log(n, phi, beta_vec.data());
    }

  }
}
#endif
